Civil MDC

2020 Structures Strengthened with Bonded Composites by Zhishen Wu, Yufei Wu, Mohamed F.M. Fahmy

Strengthening or stiffening of civil infrastructure using externally bonded fiberreinforced
polymer (FRP) composites such as FRP plates, sheets, and grids has
become a promising structural strengthening technique. It has also gained much
popularity recently, particularly in rehabilitation of structures/infrastructures due to
the worldwide deterioration problems and earthquake hazards. Their high strengthto-
weight ratio, durability in adverse environments, and high fatigue performance
make them a good choice for civil engineering applications. Moreover, FRP sheets
can easily be externally bonded to the surface of structural members. However, the
brittle behavior of FRP materials, low FRP reinforcing ratio, debonding behavior,
and other undesirable failure modes often limit the expected gains in structural performance
and leave a large portion of potentials of FRP materials unused. Besides,
the practice of the FRP bonding technique was being widely adopted without a
thorough examination of the many parameters involved. Facing these problems,
considerable studies have been conducted recently and good achievements have
been achieved through these active efforts.
This book aims to present a comprehensive account of strengthening of concrete,
reinforced and prestressed concrete, masonry, steel, and other composite structures
using externally bonded FRP composites with emphasis on giving a systematic and
fundamental investigation on bonding and debonding behavior of FRPconcrete
interface and structural performances of FRP-strengthened structures with a combination
of experimental, theoretical, and numerical studies, developing the analytical
models and design codes, and some emerging and innovative strengthening techniques.
FRP strengthening of different kinds of structures including bridge, tunnel,
building and historic structures, and underwater constructions is discussed in the

Table of Contents

The main topics covered include the following:
1 Fundamental behavior of FRP and bonding technique
2 Bond characteristics and debonding mechanism of FRP-to-concrete interface
3 FRP-strengthened tensile members
4 Flexural strengthening of structures
5 Shear and torsional strengthening of structures
6 FRP strengthening of concrete columns
7 Reinforcing spalling resistance of concrete structures with bonded FRP composites

Clear classification and discussions are made on various interfacial failure
modes from both microscopic and macroscopic viewpoints with a combination of

experimental, theoretical, and numerical studies. After clarifying the interfacial
failure mechanisms, a comprehensive design guideline including the optimum
design of strengthening composites and FRP-strengthened structures is described.
Efforts are also made to develop effective FRP strengthening with prestressed and
new composite materials (newly developed PBO and Dyneema fiber sheets).

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